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Date: Fri, 26 Aug 2005 09:21:09 -0500
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Flamible brake fluid
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How much heat would these Porsche rotors dissipate?  What's a Porsche 
weigh?  1500 lb? How much energy would that rotor have to absorb (and 
LATER dissipate) on a typical high performance afternoon?  If the 
ceramic coating insulates the disk itself (which it must since the disk 
is Al which melts at about 900 F) then all that heat must be absorbed by 
the puck, piston, caliper and fluid.  Doable if you're dealing with a 
1500 lb [relatively] slow moving vehicle.  Still wondering' why Boeing 
doesn't use them? 
Boeing does the math ... Jim S.

Ernest Christley wrote:

> Lehanover@aol.com wrote:
>
>> *Years ago, at a car show, I picked up a Porsche brake rotor that was 
>> made of aluminum and ceramic foam. It was chained to the table with a 
>> foot or so of aluminum chain. The people would pick up the 12 pound 
>> iron version, and put it down. Then the foam version would suprise 
>> them to the extent that without the chain, the rotor would have gone 
>> over their heads. Light like balsa wood. I watched hundreds of people 
>> do that test and squeal like little kids.*
>> *Picking up the light version again and again in disbeliefe.*
>> ** *Lynn E. Hanover*
>> ** ** 
>
>
> I can just picture hundreds of big, burly race car type guys standing 
> around squealling like little kids over some newfound toy.  I would've 
> stood there watching, too. (Might even have squealled once or twice 
> myself 8*)
>
> The brake rotor on the set of Goodyears I have is a fairly thin disk.  
> Weighs a couple...three pounds, at most.  Would the material your 
> referring to be cost effective compared to a disk of die cut steel 
> (assuming BOTH parts get their prices jacked up because they suddently 
> become 'aircraft' quality)?  Would it be as durable? (assuming the 
> steel stands up well to chips from gravel and such)
>